domestic cat vs Felis domesticus

domestic cat and Felis domesticus both are nouns.

Word	Noun	Adjective	Verb	Adverb
domestic cat	Yes	No	No	No
Felis domesticus	Yes	No	No	No

As nouns, domestic cat and Felis domesticus are synonyms defined as:

domestic cat and Felis domesticus: any domesticated member of the genus Felis

Other synonyms of domestic cat include Felis catus, house cat.

domestic cat (noun)	Felis domesticus (noun)
any domesticated member of the genus Felis	any domesticated member of the genus Felis